/* Copyright  (c) 2002 Graz University of Technology. All rights reserved.
 *
 * Redistribution and use in  source and binary forms, with or without 
 * modification, are permitted  provided that the following conditions are met:
 *
 * 1. Redistributions of  source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in  binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment:
 * 
 *    "This product includes software developed by IAIK of Graz University of
 *     Technology."
 * 
 *    Alternately, this acknowledgment may appear in the software itself, if 
 *    and wherever such third-party acknowledgments normally appear.
 *  
 * 4. The names "Graz University of Technology" and "IAIK of Graz University of
 *    Technology" must not be used to endorse or promote products derived from 
 *    this software without prior written permission.
 *  
 * 5. Products derived from this software may not be called 
 *    "IAIK PKCS Wrapper", nor may "IAIK" appear in their name, without prior 
 *    written permission of Graz University of Technology.
 *  
 *  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE LICENSOR BE
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 *  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 *  OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY  OF SUCH DAMAGE.
 */

package demo.pkcs.pkcs11;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;

import iaik.pkcs.pkcs11.Mechanism;
import iaik.pkcs.pkcs11.Module;
import iaik.pkcs.pkcs11.Session;
import iaik.pkcs.pkcs11.Slot;
import iaik.pkcs.pkcs11.Token;
import iaik.pkcs.pkcs11.objects.DES3SecretKey;
import iaik.pkcs.pkcs11.parameters.InitializationVectorParameters;
// import iaik.security.provider.IAIK;



/**
 * This demo program uses a PKCS#11 module to encrypt a given file and test
 * if the data can be decrpted.
 *
 * @author <a href="mailto:Karl.Scheibelhofer@iaik.at"> Karl Scheibelhofer </a>
 * @version 0.1
 * @invariants
 */
public class EncryptDecrypt {

  static PrintWriter output_;

  static {
    try {
      //output_ = new PrintWriter(new FileWriter("Encrypt_output.txt"), true);
      output_ = new PrintWriter(System.out, true);
    } catch (Throwable thr) {
      thr.printStackTrace();
      output_ = new PrintWriter(System.out, true);
    }
  }

  public static void main(String[] args) {
    if (args.length != 3) {
      printUsage();
      System.exit(1);
    }

    try {
        // Security.addProvider(new IAIK());

        Module pkcs11Module = Module.getInstance(args[0]);
        pkcs11Module.initialize(null);

        Slot[] slots = pkcs11Module.getSlotList(Module.SlotRequirement.TOKEN_PRESENT);

        if (slots.length == 0) {
          output_.println("No slot with present token found!");
          System.exit(0);
        }

        Slot selectedSlot = slots[0];
        Token token = selectedSlot.getToken();

        Session session =
            token.openSession(Token.SessionType.SERIAL_SESSION, Token.SessionReadWriteBehavior.RO_SESSION, null, null);

        // login user
        session.login(Session.UserType.USER, args[1].toCharArray());

        output_.println("################################################################################");
        output_.println("generate secret encryption/decryption key");
        Mechanism keyMechanism = Mechanism.DES3_KEY_GEN;
        DES3SecretKey secretEncryptionKeyTemplate = new DES3SecretKey();
        secretEncryptionKeyTemplate.getEncrypt().setBooleanValue(Boolean.TRUE);
        secretEncryptionKeyTemplate.getDecrypt().setBooleanValue(Boolean.TRUE);

        DES3SecretKey encryptionKey = (DES3SecretKey) session.generateKey(keyMechanism, secretEncryptionKeyTemplate);

        output_.println("################################################################################");

        output_.println("################################################################################");
        output_.println("encrypting data from file: " + args[2]);

        InputStream dataInputStream = new FileInputStream(args[2]);

        byte[] dataBuffer = new byte[1024];
        int bytesRead;
        ByteArrayOutputStream streamBuffer = new ByteArrayOutputStream();

        // feed in all data from the input stream
        while ((bytesRead = dataInputStream.read(dataBuffer)) >= 0) {
          streamBuffer.write(dataBuffer, 0, bytesRead);
        }
        Arrays.fill(dataBuffer, (byte) 0); // ensure that no data is left in the memory
        streamBuffer.flush();
        streamBuffer.close();
        byte[] rawData = streamBuffer.toByteArray();

        //be sure that your token can process the specified mechanism
        Mechanism encryptionMechanism = Mechanism.DES3_CBC_PAD;
        byte[] encryptInitializationVector = { 0, 0, 0, 0, 0, 0, 0, 0};
        InitializationVectorParameters encryptInitializationVectorParameters =
            new InitializationVectorParameters(encryptInitializationVector);
        encryptionMechanism.setParameters(encryptInitializationVectorParameters);

        // initialize for encryption
        session.encryptInit(encryptionMechanism, encryptionKey);

        byte[] encryptedData = session.encrypt(rawData);

        output_.println("################################################################################");

        output_.println("################################################################################");
        output_.println("trying to decrypt");

        //Cipher des3Cipher = Cipher.getInstance("DES3/CBC/PKCS5Padding");

        Mechanism decryptionMechanism = Mechanism.DES3_CBC_PAD;
        byte[] decryptInitializationVector = { 0, 0, 0, 0, 0, 0, 0, 0};
        InitializationVectorParameters decryptInitializationVectorParameters =
            new InitializationVectorParameters(decryptInitializationVector);
        decryptionMechanism.setParameters(decryptInitializationVectorParameters);

        // initialize for decryption
        session.decryptInit(decryptionMechanism, encryptionKey);

        byte[] decryptedData = session.decrypt(encryptedData);

        // compare initial data and decrypted data
        boolean equal = false;
        if (rawData.length != decryptedData.length) {
          equal = false;
        } else {
          equal = true;
          for (int i=0; i < rawData.length; i++) {
            if (rawData[i] != decryptedData[i]) {
              equal = false;
              break;
            }
          }
        }

        output_.println((equal) ? "successful" : "ERROR");

        output_.println("################################################################################");

        session.closeSession();
        pkcs11Module.finalize(null);

    } catch (Throwable thr) {
      thr.printStackTrace();
    }
  }

  public static void printUsage() {
    output_.println("Usage: EncryptDecrypt <PKCS#11 module> <user-PIN> <file to be encrypted>");
    output_.println(" e.g.: EncryptDecrypt pk2priv.dll password data.dat");
    output_.println("The given DLL must be in the search path of the system.");
  }

}